Anthropic Metallic Specimen

Silicon

Element Si

Small metallic mineral fragment, possibly galena or slag-like sulfide

Tentatively galena (PbS), but identification is uncertain from the image

Blue slag-like mineral specimen, possibly bornite or chalcopyrite

Tentatively bornite (Cu5FeS4) or iridescent chalcopyrite (CuFeS2)

Likely slag or metallic industrial byproduct

Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag

Small metallic mineral specimen, possibly pyrite

Pyrite (FeS₂), tentative identification

Pyrite

Iron Sulfide (FeS2)

Graphite

Graphite (Carbon, C)

Basalt

Basalt

Gold-bearing quartz vein in dark host rock

Native gold (Au) with quartz (SiO₂), likely in a mafic or metamorphic host

Polished septarian nodule

Septarian concretion; calcite/aragonite and barite-filled fractures in a carbonate-rich mudstone, commonly with pyrite

Tumbled metallic sulfide mineral, likely pyrite

Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule

Pyrite-bearing schist (likely gold-colored mica, not native gold)

Muscovite–quartz schist with pyrite; muscovite KAl₂(AlSi₃O₁₀)(OH)₂, pyrite FeS₂

Polished black obsidian

Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–80% SiO₂)

Quartz with Mica inclusions (Gold-colored Mica)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions

Aventurine Quartz

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Small dark mineral or rock fragment

Undetermined; possibly a dark mafic mineral such as biotite or magnetite

Mica Schist

Muscovite-Biotite Schist

Gold-bearing quartz specimen

Native gold (Au) in quartz, possibly with iron sulfides

Pyrite-bearing schist

Likely pyrite (FeS₂) in a mica-rich schist; exact identification requires testing

Weathered sulfide-bearing metamorphic rock (probable pyrite schist)

Quartz–mica schist with iron sulfides, chiefly pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Basalt with Sulfide/Pyrite inclusion

Aphanitic Mafic Igneous Rock (likely Basalt) with Pyrite (FeS2)

Peacock Ore

Bornite (Cu5FeS4) with surface tarnish

Serpentinite (with Pyrite/Garnet inclusions)

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4

Bismuthinite with Chalcopyrite and Quartz

Bismuthinite (Bi2S3) and Chalcopyrite (CuFeS2)

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

Unidentified dark mineral-rich stone

Likely a sulfide-bearing rock, possibly pyrite-rich matrix; exact identification requires testing

Barite Rose on Marcasite

Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)

Iron meteorite (probable)

Fe–Ni metallic meteorite, commonly kamacite–taenite

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly as crystals in a dark host rock

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Weathered iron-rich sandstone or ferruginous conglomerate

Quartz-rich sandstone cemented by iron oxides/hydroxides (primarily hematite and goethite)

Polished black-and-pink patterned stone, likely jasper or brecciated jasper

Jasper (microcrystalline quartz, SiO₂), possibly brecciated or polymict jasper with iron-oxide inclusions

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Metallic sulfide mineral specimen, possibly pyrite

Likely pyrite (FeS₂), though the photograph is insufficient for certainty

Dark metallic sulfide specimen, likely galena

Galena (lead sulfide, PbS), possibly mixed with sphalerite or other sulfides

Small metallic meteorite-like specimen

Unclassified iron-rich meteorite candidate; possibly an ordinary chondrite or terrestrial slag